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    • Antibody Discovery
      • Single Domain Antibody Discovery
      • Immunized Antibody Phage Libraries
        • Custom Llama Single Domain Antibody Discovery
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        • Naïve Llama Single Domain Antibody Phage Library
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      • Single Domain Antibody Discovery
      • Single Domain Antibody Phage Display
      • Phage Library Panning
      • Phage Library Screening
      • Single Domain Antibody Expression and Purification
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      • Single Domain Antibody Cell Binding
      • In-Vivo Vaccine Efficiency Studies
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Single Domain Antibody Phage Display

One of the most important parts of Abcore’s single domain discovery platform is our proprietary phage display technology.  We have continued to refine our protocols over the years, optimizing our phage display for single domain antibody (VHH) discovery.

Our phage display starts with either an immunized or naïve single domain antibody library.  We first use panning to enrich the library for single domain antibodies that bind to the target.  We often use pre-panning steps to address the cross-reactivity goals of the project.  We can pan to remove any binders to closely related isoforms or use a parental or knock-out cell line for cell-based projects.  Once we have performed rounds of screening, and we see good enrichment, we move to selection.

Abcore’s proprietary OPIS technology allows us to screen the enriched phage pools for positive binders in the absence of phage.  This removes the possibility of non-specific phage binders (phage is known for being very sticky) and only detect single domain antibodies that bind to the target of interest.

Abcore actually confirms binding to the target twice before even sequencing the clones.  We call this OPIS 1 and OPIS 2.  After OPIS 2, we sequence all positive clones from the first screening plate(s) and we then de-replicate this list to deliver a list of positive, unique single domain VHH antibody binders.

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